Word Study
cloud-cuckoo-land
CIDE DICTIONARY
cloud-cuckoo-land, n.
an imaginary place where fantasy and illusion predominate; it is a place where you say people are when they seem optimistically out of touch with reality. [WordNet 1.5]
OXFORD DICTIONARY
cloud-cuckoo-land, n. a fanciful or ideal place.
Etymology
transl. of Gk Nephelokokkugia f. nephele cloud + kokkux cuckoo (in Aristophanes' Birds)
For further exploring for "cloud-cuckoo-land" in Webster Dictionary Online